The prospective stratigraphic traps of hydrocarbons in the Apsheron suite of seismic data (on the example of the square called “Khasilat” in the south-east of the Apsheron peninsula)

Tofik Rashid ogly Akhmedov

T. R. Akhmedov / News of the Ural State Mining University 1 (2018) 18–22 DOI 10.21440/2307-2091-2018-1-18-22

The urgency of the problem. The main object of the two centuries of industrial oil and gas production in Azerbaijan, particularly in the Apsheron Peninsula, is a separate Suite of the productive series (PT) of lower Pliocene. The deposits of the Apsheron Pleistocene suites are also oil-and-gas bearing in some areas, as well as neighboring areas of the lower Kura depression. The reconnaissance and exploration of oil and gas traps in the sediments of the Apsheron suites are the most urgent challenge facing geologists and geophysicists of Azerbaijan.

Purpose of the work. The allocation and tracing of stratigraphic traps of hydrocarbons in seismic data is being tested by a company called “Pangaea”. This is done by a series of procedures including the use of taxonomy, classification, and seismostratigraphic approach for interpretation of wave patterns. Methods and results of the study. The brief lithological-stratigraphic characteristic of sediments of the Apsheron formation is given in this research. The wave pattern, which is observed in the interval spanning of these deposits in the geological section, is described as well. The correlation of the seismic horizons in the interval of occurrence of Apsheron sediments was performed with the usage of the automatic and manual tracking reflectors on temporary cubes. The cubes of the seismic attributes and dynamic parameters of seismic vibrations were used.

Research result. As a result of correlation, the six seismic horizons at different time intervals have been identified: a reflecting horizon Ар_1 is traced by the center of the positive phase in the time interval of 170–1220 MS, a reflecting horizon Ар_2 is traced in the center of the positive phase in the range of 250–1200 MS, a reflecting horizon Ар_3_1 is correlated in the center of the positive phase in the interval 200–1000 MS, a reflecting horizon Ар_3_2 is confined to the center of the positive phase and is in the range 190-990 MS, a reflecting horizon Ар_4 is correlated in the center of the positive phase in the time interval of registration 160–880 MS, and a reflecting horizon Ар_5 is traced by the center of the positive phase in the time interval of registration 230-520 MS. All of these seismic horizons are correlated with serious difficulties due to the high interference of waves and the instability of the seismic signal. Therefore, the results of the correlation are ambiguous. The results of the reprocessing and re-interpretation of 3D seismic data on one of the squares South-East of the Apsheron Peninsula are being considered.

Summary. It is demonstrated that using the methods of nonstandard classification of the company “Pangaea” we were able to identify the three anomalous areas of seismic records which are likely to be associated with the stratigraphic traps.

Keywords: Apsheron suite; productive strata; Pliocene; 3D seismic; stratigraphic trap.

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